IPA's of today are a long way from what they were back in the day of long shipping time on the ocean. The hops oil was used as a preservative that gave a bitter flavor. But hat oil has a short life when in a container that lets O2 and/ or light in. The aroma 1st the first to go, then flavor, and last the bitterness. But the taste they wanted back then is very different than what is wanted now. What was a hoppy beer in the 1700's would barely be a pale ale now.
Now with the New England IPA style coming on strong, it even harder to keep all that juicy, citrus smells and flavors in. So, bottle do a poor job because there is always some cap gas escaping and even with the dark bottles, some light gets in. Even using cans, most breweries short date the product to get the best flavor to the consumer. It's the main reason that you don't see much of it on the shelf from brewries far off, well not much that live up to what is expected. It is a "drink local" type of beer, lol.
A little more on it:
https://www.americancraftbeer.com/6-reasons-craft-beer-industry-moving-cans/